Summary: pretty simple. add ram, cpu (no heatsink/fan, the case has one already) thermal pasted, and optional hard drive, and this thing's running away. using Debian 7 on it as a microserver. Works wonders headless!
Summary: I love this little PC! So fast and quiet. Yes, I can hear it running while mounted to the back of my monitor, but it doesn't bother me at all. I used an i3 processor and it really does perform flawlessly running Windows 7.
Summary: I purchased this to run as a router for my home network. I have a network larger than most folks, but I don't run a lot of features on my router. Sometimes I'll connect in remotely via VPN and I do run QoS, but that's about as taxing as I get with this. Coupled with a core i3 processor, this should easily handle multiple VPN connections and lots of QoS traffic. I think these are perfect for Linux or xBSD based servers and appliances.
Summary: This is my Man Cave PC. Its mounted under a shelf hooked up to my stereo system and a 32" LCD. I've also got a 17" LCD as a secondary monitor. Great for watching movies and surfing the net while hiding out. I also mounted a WIFI/Bluetooth card and dual antennas. Used parts for a broken Laptop to build this. The Laptop's LCD was busted. Moved the RAM, Hard Drive, WIFI NIC over. Only thing I had to buy was a CPU.
Summary: For its size, it's really packed with a lot of functionality. Its small, quiet and unobtrusive. It can be the perfect PC for many roles such as HTPC, Server, SFF PC, and Kiosk PC. Due to its small size, it can only support CPUs with a TDP of 65W or less. It has 2 SODIMM slots and can support 16GB of Ram. It has 2xSata II and 1xmstata ports. It has 2xGigabit NICs that can be teamed. It can support 1x2.5" device. The quality of case and build is enterprise grade.
Summary: Put an I5 core in it 8 gigs of ram a ssd and a non raid drive box(my own preference). This was replacing an old AMD 6 core desktop and so far I have had no issues. The shuttle is so quiet you cant even tell that its is on.